Yellowjackets in Southern New Hampshire — Identification, Nests, Stings & Removal
TL;DR
Yellowjackets are black-and-yellow (or black-and-white) social wasps of genera Vespula and Dolichovespula. New Hampshire hosts at least nine species, dominated by the native eastern yellowjacket (Vespula maculifrons) in the ground and the invasive German yellowjacket (V. germanica) in wall voids of older Manchester, Nashua, and Concord homes. Colonies are annual — founded by one overwintered queen in late April or early May, peaking at 1,000–5,000 workers by mid-August, then collapsing after Manchester's first hard frost around October 19.
NH yellowjacket species
9+
4 dominant in service area
Worker size
~12–13 mm (½ in)
V. maculifrons / V. germanica
Colony peak
Mid-Aug – mid-Sep
1,000–5,000 workers (V. maculifrons)
First frost Manchester
~Oct 19 (50%)
NOAA 1991–2020 normals
Your Guide to Yellow Jackets in Southern New Hampshire
This is the orchestrator page for Anchor Pest Services' 20-page yellow jacket guide. From here you can navigate into six clusters: **Identification** (what's that wasp?), **Nest** (where they build), **Sting** (first aid, NH ERs, when to call 911), **Comparison** (yellow jacket vs wasp vs hornet vs paper wasp), **Control** (removal, exterminator service, prevention), and **Biology** (lifecycle, winter dieback). Every cluster card below routes deeper.
We operate under New Hampshire license #782664, category F1 under RSA 430, administered by the NH Department of Agriculture, Markets & Food. We are a member of NEPMA (New England Pest Management Association, founded 1933). Our office is at 700 Harvey Rd, Bldg 1, Manchester, and we serve 15 cities across Rockingham, Hillsborough, Merrimack, and Strafford counties — with the Lakes Region served secondarily. Anchor has been family-owned and operating in NH since 2017.
A quick callout to head off the most common southern-NH confusion: **the bald-faced hornet (Dolichovespula maculata) IS taxonomically a yellow jacket**, not a true hornet. **The European hornet (Vespa crabro) IS a true hornet, IS established in NH since around 1840, and is NOT a yellow jacket** — it's the largest stinging insect in the state (workers ~25 mm, queens ~35 mm). If a huge wasp is at your Manchester porch light at night in October, that's almost certainly a European hornet.
What Makes NH Yellow Jackets Different
New Hampshire's iconic landscape and older housing stock shape yellow jacket pressure in ways that don't appear in generic encyclopedia pages. **Stone walls** — granite property lines and old fieldstone foundations threaded through Rockingham and Hillsborough counties — are textbook eastern yellowjacket (Vespula maculifrons) ground nest habitat and queen overwintering hibernacula. **Cedar shingles and clapboard siding** on pre-1980 Manchester, Concord, and Portsmouth homes give the invasive German yellowjacket (V. germanica) easy access to wall voids and attics. The **Londonderry / Bedford apple country** drops fermenting fruit August through October, drawing late-season sugar foragers. **NH maple sugar shacks** store sap residue that wasps find irresistible. Late-August lake-house BBQs at Lake Winnipesaukee, Sunapee, and Squam are the canonical NH yellow jacket complaint. Hiking-trail ground nests on Mt Monadnock, in the White Mountains, and at Bear Brook (Allenstown) and Pawtuckaway (Nottingham) state parks produce most of NH's mass-sting incidents. Manchester's first hard frost averages October 19 at 50% probability and October 29 at 80% probability per NOAA Manchester-Boston Regional Airport 1991–2020 climate normals. Concord runs slightly earlier — first frost around September 27 to October 3. Within a week of that hard freeze, every colony member except the newly mated queens dies. The mated queens overwinter alone in stone walls, woodpiles, cedar shingles, attic insulation, and rotted barn wood — which is why a property that hosted a colony one year often hosts a new colony the next.
Species present in NH
- Eastern yellowjacket (Vespula maculifrons)
- German yellowjacket (Vespula germanica)
- Common yellowjacket (Vespula alascensis)
- Downy yellowjacket (Vespula flavopilosa)
- Bald-faced hornet (Dolichovespula maculata)
- Aerial yellowjacket (Dolichovespula arenaria)
Peak activity
Mid-August through mid-September (colony peak, aggression peak, sugar scavenging)
Service area
First-frost anchor: Manchester first hard frost ~Oct 19 (50%) / ~Oct 29 (80%) per NOAA Manchester-Boston Regional Airport 1991–2020 normals
Per UNH Cooperative Extension's Alan Eaton (Resource000532), NH yellow jacket colonies should be treated after dark when foragers are home and aggression is lowest.
How to identify a yellowjacket
A yellow jacket is a slender, hard-bodied wasp about 12–13 mm long with a sharply pinched waist, bright yellow-and-black bands, black thread-like antennae, and a smooth (barbless) stinger. Unlike fuzzy honey bees, yellow jackets are nearly hairless, fold their wings lengthwise at rest, and tuck their legs close in flight. The species table below covers all six NH yellow jackets you're likely to meet — plus one true hornet (Vespa crabro) for disambiguation.
- 01
Body length
Worker 12–13 mm (V. maculifrons / V. germanica); queen 18–19 mm; bald-faced hornet worker 15–18 mm; European hornet worker ~25 mm.
- 02
Coloration
Yellow and black bands on Vespula species (V. maculifrons has an anchor-shaped mark on the first abdominal segment; V. germanica has diamond marks plus side spots). Dolichovespula maculata is black-and-white instead of yellow-and-black.
- 03
Waist
Sharply pinched 'wasp waist' — a key separator from honey bees and bumblebees, which lack the visible constriction between thorax and abdomen.
- 04
Antennae
Long, jointed, dark — used to detect sugar plumes, protein cues, and CO₂. Distinct from straight beaded termite antennae and the elbowed antennae of carpenter ants.
- 05
Wings
Two pairs, folded lengthwise along the body at rest. Honey bees fold wings flat over the abdomen; yellow jackets do not.
- 06
Legs in flight
Tucked close to the body — distinct from paper wasps (Polistes), which dangle their long hind legs in flight.
- 07
Stinger
Smooth and barbless — a single yellow jacket can sting 5–20+ times. Honey bees have barbed stingers, sting once, then die.
Yellowjacket species in New Hampshire
Prevalence based on UNH Cooperative Extension survey data.
| Species | Size | NH status | Prevalence | Typical nest |
|---|---|---|---|---|
Eastern yellowjacket Vespula maculifrons | 12–13 worker / 18–19 queen mm | native | HIGH | Ground burrows, stone-wall bases, abandoned rodent holes |
German yellowjacket Vespula germanica | 12–13 worker / 17–18 queen mm | invasive | HIGH | Wall voids, attics, hollow trees |
Common yellowjacket Vespula alascensis | 12–14 worker mm | native | MEDIUM | Ground burrows, occasionally aerial or void |
Downy yellowjacket Vespula flavopilosa | 12–13 worker mm | native | LOW | Ground burrows |
Bald-faced hornet Dolichovespula maculata | 15–18 worker / ~20 queen mm | native | MEDIUM | Aerial paper envelope, 5–60 ft up; up to 58 cm long |
Aerial yellowjacket Dolichovespula arenaria | 10–14 worker / ~16 queen mm | native | MEDIUM | Aerial nests in shrubs, low branches, eaves |
Quick ID quiz
Three quick questions to narrow down what you're seeing. If you're unsure, lean toward calling Anchor for an on-site ID — sting risk rises sharply with peak season and unknown species.
What color is the wasp?
Frequently asked
Yellowjackets gone — and they stay gone.
Same-day service across Southern New Hampshire. NH-licensed #782664. Family-owned since 2017. We handle ground, wall, and aerial nests with EPA-registered products and a 30-day re-treat guarantee.